If it were me, I’d grab my home office computer. It has gobs of family photos and videos on it—nearly one terabyte and two decades worth. It would likely be several times larger than that, but
For years I paid and used an online backup service. But then it didn’t work so well. So I backed up some of my library on Google but have yet to organize and upload everything.
But that’s not really the point. The point is thinking about what you value most. And since I value experiences over things, I suppose the only things I really collect are memories and photos.
So that’s what I would reach for first in a blazing inferno.